Page 18 - GuardII+ Series 4208 Platform Flux User Manual

GuardII+ Flux Card Operation

• The GuardII+ is commissioned and turned on for the first time on Thursday at 8:45
a.m.
• The first measurement will be taken and saved on Thursday at 9:00 a.m.; this
measurement is at load point 5.
• Measurements will be stored every 30 minutes until 100 measurements have been
saved; the measurements may be saved in one or more load bins based on the
generator load during that period, although in this example they will all be stored in
load bin 5. Suppose that there is a noise problem with the flux signal that causes some
of the measurements to fail; all failed measurements will be stored in the extra load
point bin.

• The first 100 measurements will be saved by 11:30 a.m. on Saturday. Now,
measurements will be saved daily.

• The first measurement on Sunday occurs at 12:00 a.m.; this one happens to be at load
point 5 and is saved. Additionally, the measurement at 6:30 is at a different load point,
so that one will be saved as well.
• The first measurement on Monday occurs at 12:00 a.m.; this one is saved in the load
point 6 bin.
• The first measurement on Tuesday occurs at 12:00 a.m.; this one is saved in the load
point 6 bin.
• The machine is shut down at 5:45 a.m. on Tuesday and isn’t started again until 10:50
p.m. on Thursday. The daily measurements at 12:00 a.m. on Wednesday and
Thursday will not be possible due to a low signal amplitude and will not be saved.

• The 12:00 a.m. measurements on Friday, Saturday and Sunday will succeed and will
be stored in the load point 6 bin.

• At 8:20 Saturday morning the flux data is downloaded.
• The next measurement occurs at 8:30 a.m. and is at load point 6. Since the data was
just downloaded, this resets the 100-measurement count for rapid data storage.
• Every measurement will now be stored in its appropriate load point bin until 100
measurements have been saved; then the monitor will start saving the first
measurement of the day at each load point again.

4.6. Modbus Outputs
Flux Measurement data is hosted inside the monitor for an external Modbus master to
read. To access the data registers, connect to the GuardII+ using Ethernet and query the
monitor using the standard Modbus over TCP/IP protocol. This data is updated during every
measurement cycle. Modbus data outputs include:

• Measurement time
• Measurement status
• Measurement results per pole (for salient pole machines)

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